Valve bag



Feb. 2', 19054 T. L. JON ES VALVE BAG yFiled June 5, 1950 Patented Feb. 2, 1954 f' f UNITED STATES PATENT OFFICE VALVE BAG Tom L. Jones, Columbus, Ohio, assignor to Arkell and Smiths, a corporation of New York Application June 3, 1950, Serial No. 165,949

(Cl. 22S-62.5)

4 Claims. l

This invention relates to an improved valve construction for valve bags of the multiwall type having pasted ends. These bags have what is ordinarily termed a diamond end closure in which side flaps are folded over the inwardlyv folded corners or end naps.

In carrying out my invention I provide a transverse slit through at least one ply of an inwardly folded corner so that a tapered lling nozzle can be inserted into the bag between the plies. Such lling slits have previously been suggested but I find that to make the use of such a slit practical, it is necessary that the slit be located far enough toward the center of the bag so that at least two-thirds of the slit is covered by the side flaps. When this is done the slit member acts as a guide to carry the filling nozzle under the side iiaps and the side flaps provide the necessary strength to support the bag during filling. Otherwise the bag is supported only by the thickness of one or more plies which may have a tendency to tear and destroy valve action.

I have found that when the filling slit is placed under the side naps as described, the location of the slit is so near the inner edge of the end ilap that normally very little valving action is supplied. I solve this difficulty by extending at least one of the inner plies of the inturned end flap so as to give supplemental valving action. By thus locating the slit where the overlying side aps give necessary strength and by supplementing the valve action with an extension on one of the end flaps the two cooperate to make a valve which is exceptionally easy to fill and at the same time which has been shown in operation to be free from leakage.

This invention can readily be understood by reference to the accompanying drawing in which: Fig. 1 is a side view of one end portion of the bag with the end partially closed and a portion of the outer ply cut away; Fig. 2 is a top view with the end completely closed; Fig. 3 is a sectional view taken on line 3 3 of Fig. 2 with certain of the side flap plies omitted; Fig. 4 is a similar view showing a modified form of the present invention with a filling tube shown in dotted lines.

Bag lil illustrated in Figs. 1-3 of the drawing is made of two plies I2 and I4 of paper but the number of the plies may be varied (see Fig. 4). As shown in Fig. 1, plies I2 and I4 preferably are held together at the corners by paste I6. As also shown in Fig. 1 the end closure is formed in the usual manner for pasted end bags.

2 Y End flaps I8 are formedv by infolding opposite portions of the bag wall between longitudinal cuts and the remaining upright portions 22 constitute the side naps. To complete the end closure, side flaps 22 are folded over on lines 24 and pasted to the end ilaps and to each other by glue or paste 2S which has been previously applied.

In accor-dance' with the vpresent invention a transverse slit 2&3 corresponding in length to the width of the end closure is cut through the outer ply of .one end ilap I8. The slit is positioned with its end portions located under side flaps 22 (shown in open position) so that at least twothirds of the slit lies under the protective covering of the side iiaps when the end closure is completed. The middle portion of slit 28 left uncovered by the side aps forms lip 30 (see Fig. 2). Lip 30 need only be large enough to aid in in- 20 serting the tapered filling nozzle and is actually equal to the distance between inner edge 34 of the end ap and slit 28, I achieve an effective increase in valving action which doubles the length of the valve sealing area. This elongation 32 of inner ply I4 is not attached at either side or outer edge and the corresponding area of inner ply I4 underlying outer ply I2 is left unglued so that the iilling nozzle can be easily inserted into the valve sealing area.

In this construction filling is accomplished by inserting a tapered iilling nozzle into the bag through slit 28 with lip 3D serving as a guide to carry the nozzle under the side flaps. The nozzle distorts slit 28 to capacity. However, side flaps 22 resist and withstand this distortive force to eliminate the hazard of tearing outer ply I2 and the added strength of the side iiaps provides a strong support for the bag during filling. After the bag is lled and the nozzle removed the supplemental valve sealing area of elongation 32 forms an exceptionally long valve closure which prevents leakage of material through the valve.

Y Absence of interply adhesive I6 in the valve sealing area lends a high degree of iiexibility to inner ply I4 which allows easy passage for the tapered lling nozzle and facilitates automatic sealing of the bag. So constructed I find that the combination of a protected filling slit and a long valve sealing area provides a valve with effective sealing action which cannot be damaged during lling.

A modified form of this invention for a four ply bag is shown in Fig. 4. Here slit 28 is cut through two of the plies and one of the remaining plies is extended to form elongation 32. A tapered iilling nozzle 36 isishown inserted into the bag illustrating the necessity for exibility of inner ply I4 which is shown in depressed position for the lling operation. After lling the nozzle is removed, the valve sealing area exes upwardly against the side flaps to seal the bag.

It will be understood that it is intended to cover all changes and modifications of the preferred embodiment of the invention herein chosen for the purpose of illustration which do not constitute departures from the spirit and scope of the invention.

What I claim is:

1. In a non-gusseted bag having walls comprising a plurality of plies of paper with an end closure of end naps formed by infolding opposite portions of the bag wall and side naps also formed by infolding opposite portions oi the bag wall covering said end naps, the combination which comprises a transverse slit in the outer ply of one of the end flaps which delineates a valve and valve action area extending inwardly between the plies of the end flap from said slit, to the inner edge of the bag wall, said slit being positioned with a substantial portion of its length covered by the side naps and said end ap having a rectangular elongation of at least one of its inner plies beyond the lateral edge of the bag Wall in the valve to form a supplemental valve and valve action area and said elongation being of the same width as the said valve and Valve action area.

2. A structure as specified in claim 1 in which the elongation is attached to the bag walls solely' along its base so that itl is free to flex upwardly against the end closure for sealing the bag.

3. A structure as specified in claim 1 in which the elongation is equal to the distance between the inner edge of said end flap and the transverse slit.

4. A structure as specified in claim 1 in which the slit is cut through a plurality of plies.

TOM L. JONES.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 2,045,585 Coty June 30, 1936 2,269,849 Hahn Jan. 13, 1942 2,270,842 Crawford Jan. 27, 1942 2,294,846 Haungs Sept. 1, 1942 2,338,254 Miller Jan. 4, 1944 2,392,094 Lee Jan. 1, 1946 

